Abstract: The magnetization measurements at 5 K were carried out for Ni2Mn1 −xCuxGa (0 ≤ x≤ 0.40) and Ni2MnGa1 −yCuy(0 ≤ y≤ 0.25) alloys. All of the magnetization curves are characteristic of ferromagnetism or ferrimagnetism. By using Arrott plot analysis the spontaneous magnetization of all samples was determined from the magnetization curves. The magnetic moment per formula unit, μs, at 5 K was estimated from the spontaneous magnetization. For Ni2Mn1 −xCuxGa (0 ≤ x≤ 0.40) alloys μs at 5 K decreases linearly with increasing x. On the other hand, the μs at 5 K for Ni2MnGa1 −yCuy (0 ≤ y≤ 0.25) alloys decreases more steeply with increasing x compared to the μs for Ni2Mn1 −xCuxGa (0 ≤ x≤ 0.40) alloys. On the basis of the experimental results, the site-occupation configurations of Ni2Mn1 −xCuxGa (0 ≤ x≤ 0.40) and Ni2MnGa1 −yCuy(0 ≤ y≤ 0.25) alloys are proposed.

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